416 lines
9.0 KiB
C++
416 lines
9.0 KiB
C++
/*
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* This file Copyright (C) Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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*/
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#include <algorithm>
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#include <array>
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#include <cctype>
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#include <cstddef>
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#include <optional>
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#include <string_view>
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#include <event2/buffer.h>
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#include "transmission.h"
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#include "net.h"
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#include "web-utils.h"
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#include "utils.h"
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using namespace std::literals;
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/***
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****
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***/
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bool tr_addressIsIP(char const* str)
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{
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tr_address tmp;
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return tr_address_from_string(&tmp, str);
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}
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char const* tr_webGetResponseStr(long code)
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{
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switch (code)
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{
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case 0:
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return "No Response";
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case 101:
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return "Switching Protocols";
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case 200:
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return "OK";
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case 201:
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return "Created";
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case 202:
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return "Accepted";
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case 203:
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return "Non-Authoritative Information";
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case 204:
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return "No Content";
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case 205:
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return "Reset Content";
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case 206:
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return "Partial Content";
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case 300:
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return "Multiple Choices";
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case 301:
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return "Moved Permanently";
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case 302:
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return "Found";
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case 303:
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return "See Other";
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case 304:
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return "Not Modified";
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case 305:
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return "Use Proxy";
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case 306:
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return " (Unused)";
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case 307:
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return "Temporary Redirect";
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case 400:
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return "Bad Request";
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case 401:
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return "Unauthorized";
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case 402:
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return "Payment Required";
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case 403:
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return "Forbidden";
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case 404:
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return "Not Found";
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case 405:
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return "Method Not Allowed";
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case 406:
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return "Not Acceptable";
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case 407:
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return "Proxy Authentication Required";
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case 408:
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return "Request Timeout";
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case 409:
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return "Conflict";
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case 410:
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return "Gone";
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case 411:
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return "Length Required";
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case 412:
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return "Precondition Failed";
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case 413:
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return "Request Entity Too Large";
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case 414:
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return "Request-URI Too Long";
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case 415:
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return "Unsupported Media Type";
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case 416:
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return "Requested Range Not Satisfiable";
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case 417:
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return "Expectation Failed";
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case 421:
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return "Misdirected Request";
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case 500:
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return "Internal Server Error";
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case 501:
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return "Not Implemented";
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case 502:
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return "Bad Gateway";
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case 503:
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return "Service Unavailable";
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case 504:
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return "Gateway Timeout";
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case 505:
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return "HTTP Version Not Supported";
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default:
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return "Unknown Error";
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}
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}
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void tr_http_escape(struct evbuffer* out, std::string_view str, bool escape_reserved)
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{
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auto constexpr ReservedChars = std::string_view{ "!*'();:@&=+$,/?%#[]" };
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auto constexpr UnescapedChars = std::string_view{ "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_.~" };
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for (auto& ch : str)
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{
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if (tr_strvContains(UnescapedChars, ch) || (tr_strvContains(ReservedChars, ch) && !escape_reserved))
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{
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evbuffer_add_printf(out, "%c", ch);
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}
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else
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{
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evbuffer_add_printf(out, "%%%02X", (unsigned)(ch & 0xFF));
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}
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}
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}
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static bool is_rfc2396_alnum(uint8_t ch)
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{
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return ('0' <= ch && ch <= '9') || ('A' <= ch && ch <= 'Z') || ('a' <= ch && ch <= 'z') || ch == '.' || ch == '-' ||
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ch == '_' || ch == '~';
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}
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void tr_http_escape_sha1(char* out, tr_sha1_digest_t const& digest)
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{
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for (auto const b : digest)
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{
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if (is_rfc2396_alnum(uint8_t(b)))
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{
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*out++ = (char)b;
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}
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else
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{
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out += tr_snprintf(out, 4, "%%%02x", (unsigned int)b);
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}
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}
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*out = '\0';
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}
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void tr_http_escape_sha1(char* out, uint8_t const* sha1_digest)
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{
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auto digest = tr_sha1_digest_t{};
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std::copy_n(reinterpret_cast<std::byte const*>(sha1_digest), std::size(digest), std::begin(digest));
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tr_http_escape_sha1(out, digest);
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}
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//// URLs
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namespace
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{
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int parsePort(std::string_view port)
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{
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auto tmp = std::array<char, 16>{};
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if (std::size(port) >= std::size(tmp))
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{
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return -1;
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}
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std::copy(std::begin(port), std::end(port), std::begin(tmp));
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char* end = nullptr;
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long port_num = strtol(std::data(tmp), &end, 10);
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if (*end != '\0' || port_num <= 0 || port_num >= 65536)
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{
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port_num = -1;
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}
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return int(port_num);
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}
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constexpr std::string_view getPortForScheme(std::string_view scheme)
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{
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auto constexpr KnownSchemes = std::array<std::pair<std::string_view, std::string_view>, 5>{ {
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{ "ftp"sv, "21"sv },
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{ "http"sv, "80"sv },
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{ "https"sv, "443"sv },
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{ "sftp"sv, "22"sv },
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{ "udp"sv, "80"sv },
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} };
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for (auto const& [known_scheme, port] : KnownSchemes)
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{
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if (scheme == known_scheme)
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{
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return port;
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}
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}
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return "-1"sv;
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}
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bool urlCharsAreValid(std::string_view url)
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{
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// rfc2396
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auto constexpr ValidChars = std::string_view{
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"abcdefghijklmnopqrstuvwxyz" // lowalpha
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" // upalpha
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"0123456789" // digit
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"-_.!~*'()" // mark
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";/?:@&=+$," // reserved
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"<>#%<\"" // delims
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"{}|\\^[]`" // unwise
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};
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return !std::empty(url) &&
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std::all_of(std::begin(url), std::end(url), [&ValidChars](auto ch) { return tr_strvContains(ValidChars, ch); });
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}
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bool tr_isValidTrackerScheme(std::string_view scheme)
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{
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auto constexpr Schemes = std::array<std::string_view, 3>{ "http"sv, "https"sv, "udp"sv };
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return std::find(std::begin(Schemes), std::end(Schemes), scheme) != std::end(Schemes);
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}
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} // namespace
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std::optional<tr_url_parsed_t> tr_urlParse(std::string_view url)
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{
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url = tr_strvStrip(url);
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if (!urlCharsAreValid(url))
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{
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return {};
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}
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auto parsed = tr_url_parsed_t{};
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parsed.full = url;
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// scheme
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parsed.scheme = tr_strvSep(&url, ':');
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if (std::empty(parsed.scheme))
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{
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return {};
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}
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// authority
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// The authority component is preceded by a double slash ("//") and is
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// terminated by the next slash ("/"), question mark ("?"), or number
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// sign ("#") character, or by the end of the URI.
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auto key = "//"sv;
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if (tr_strvStartsWith(url, key))
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{
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url.remove_prefix(std::size(key));
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auto pos = url.find_first_of("/?#");
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parsed.authority = url.substr(0, pos);
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url = pos == url.npos ? ""sv : url.substr(pos);
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auto remain = parsed.authority;
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parsed.host = tr_strvSep(&remain, ':');
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parsed.portstr = !std::empty(remain) ? remain : getPortForScheme(parsed.scheme);
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parsed.port = parsePort(parsed.portstr);
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}
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// The path is terminated by the first question mark ("?") or
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// number sign ("#") character, or by the end of the URI.
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auto pos = url.find_first_of("?#");
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parsed.path = url.substr(0, pos);
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url = pos == url.npos ? ""sv : url.substr(pos);
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// query
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if (url.find('?') == 0)
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{
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url.remove_prefix(1);
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pos = url.find('#');
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parsed.query = url.substr(0, pos);
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url = pos == url.npos ? ""sv : url.substr(pos);
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}
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// fragment
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if (url.find('#') == 0)
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{
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parsed.fragment = url.substr(1);
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}
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return parsed;
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}
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std::optional<tr_url_parsed_t> tr_urlParseTracker(std::string_view url)
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{
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auto const parsed = tr_urlParse(url);
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return parsed && tr_isValidTrackerScheme(parsed->scheme) ? *parsed : std::optional<tr_url_parsed_t>{};
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}
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bool tr_urlIsValidTracker(std::string_view url)
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{
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return !!tr_urlParseTracker(url);
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}
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bool tr_urlIsValid(std::string_view url)
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{
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auto constexpr Schemes = std::array<std::string_view, 5>{ "http"sv, "https"sv, "ftp"sv, "sftp"sv, "udp"sv };
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auto const parsed = tr_urlParse(url);
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return parsed && std::find(std::begin(Schemes), std::end(Schemes), parsed->scheme) != std::end(Schemes);
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}
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tr_url_query_view::iterator& tr_url_query_view::iterator::operator++()
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{
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auto pair = tr_strvSep(&remain, '&');
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keyval.first = tr_strvSep(&pair, '=');
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keyval.second = pair;
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return *this;
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}
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tr_url_query_view::iterator tr_url_query_view::begin() const
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{
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auto it = iterator{};
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it.remain = query;
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++it;
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return it;
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}
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std::string tr_urlPercentDecode(std::string_view in)
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{
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auto out = std::string{};
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out.reserve(std::size(in));
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for (;;)
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{
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auto pos = in.find('%');
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out += in.substr(0, pos);
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if (pos == in.npos)
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{
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break;
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}
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in.remove_prefix(pos);
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if (std::size(in) >= 3 && in[0] == '%' && std::isxdigit(in[1]) && std::isxdigit(in[2]))
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{
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auto hexstr = std::array<char, 3>{ in[1], in[2], '\0' };
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auto const hex = strtoul(std::data(hexstr), nullptr, 16);
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out += char(hex);
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in.remove_prefix(3);
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}
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else
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{
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out += in.front();
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in.remove_prefix(1);
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}
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}
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return out;
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}
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